Added a test for destroying an isolate while a timer is outstanding.

Cleaned up a few of the existing tests.

BUG=
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/100143006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243185 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243185
[Telemetry]: Assert that page measurement results don't contain a '.' in their name.

Telemetry uses a '.' to delimit chart_name and trace_names in Value types, so
trace names cannot include a '.' in them.

BUG=329845

Review URL: https://codereview.chromium.org/116043006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243186 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243186